I, too, cannot send or reply in a group text. I rec'v the text, and can see the addressees and sender. I can enter reply text, but the send tries, then fails. I have to send individual replied to each person in the list. I have Samsung Galaxy S5 w/AT&T. Mobile data is on. Note I also cannot send a photo from my phone's camera in/attached to a text msgs, tho I can receive them.
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